@book { PsychosomatischeErkrankungen,
    title = "Psychosomatische Erkrankungen",
    author = "Anna {Peterka}",
    year = "2000",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638088367",
    url = "https://www.hausarbeiten.de/document/96159"
}